Our proposal shares some elements with the one in Refs. [1]}, [2]} but offers several advantages: (1) it requires only one topological island and one JJ FET instead of two; (2) in addition to initialization and readout, it requires only two steps to perform fusion instead of three; (3) The outcome of the fusion protocol can be read out by measuring the charge pumped between the JJ FET and the TS leads, leading to a DC current when the protocol is done periodically; (4) the geometry in Fig. REF  (a) has already been investigated in semiconductor-superconductor platforms [3]}, [4]}, [5]}, [6]}; (5) detecting the regime where all parts of the structure are in the required TS phase can be done rather straightforward based on a measurement of the supercurrent [7]}.
